20. He will come ____ three days. A.before B.after C. in D. later
19.The PLA man saved the boy ____ death. A. of B.from C.to D.on
18.The group is made up____five students. And they are studying hard to make up____ the lost time.
A.of,of B.for,for C.of,for D.for,of
17.The boy is waiting ____ his sister and they will go to the hospital to wait ____ their sick mother.
A.for,on B.on,for C.for,for D.on.on
16. Fresh air is good ____ your health. A.at B.for C.of D.to
15. It's very kind____ you to repair the bike ____ me.
A.for.for B.of,of C.of,for D.for,of
14. We go to school ____ a bike. A.in B.on C.by D.ove
13. It happened ____ the Long March. A. during B.in C.at D.for
12. The window is never opened ____ in summer. A. but B. except C. except for D. but for
11. Nobody knows it ____ me. A. except for B. except that C. besides D. but